Robert Stuart Hamilton, CM, Hon. LL.D, A.R.C.T. (September 28, 1929 – January 1, 2017) was an award-winning Canadian accompanist, vocal coach, and opera producer based in Toronto. He was a well-known advocate of post-Baroque French opera. He was recognized nationally for his work as the longtime quiz master for CBC Radio’s Saturday Afternoon at the Opera, he taught opera repertoire and diction at the University of Toronto.